The theoretical expectation of Max Weber, the refinement of that expectation by Glock and Stark, and the empirical findings of Glock, Ringer and Babble that social deprivation is related to religiosity in church-type religious institutions is further tested. Three indices of social deprivation (sex, age, and education) are combined into a composite index and correlated with indices of types of religiosity in a Roman Catholic parish. In addition, a composite religiosity index is correlated with each of the social deprivation variables: sex, age, and education. The findings substantiate the social deprivation model.